Effect of Different Heat Treatments with and without Deep Cryogenic Treatment on the Morphology of Mg17Al12 Intermetallic Phase and Hardness of AZ91 Magnesium Alloy
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M. Khosroaghayani
Seyed Reza Alavi Zaree was born in 1976 and studied B.Sc. of Metallurgy and Materials Science Engineering at Tehran University since 1994 to 1999 and then he studied M. Sc. of Metallurgy and Materials Science at Iran university of Science & Technology since 1999 to 2001. He got his doctorate at Institut für Werkstoffwissenschaft und Werkstofftechnologie, TU-Wien, Vienna, Austria in 2009 with a thesis on Characterization of hot extruded steel particulate composites. since 2009 to present, he is Assistant Professor in metallurgy and materials science at Shahid Chamran University of Ahvaz in Iran.
Abstract
In this study, dissolution of the Mg17Al12 phase carried out at 413 °C within 24 h and process followed by cooling the samples in different media with various cooling rates. Some samples were directly aged and others were held in liquid nitrogen for 24 h prior to aging. In this study for investigation of microstructure, the specimens were studied using a Meiji optical microscope and Scanning Electron Microscopy and Energy Dispersive Spectroscopy analysis was used to characterize the chemical composition of the phases. Results showed that at low cooling rates, a large amount of discontinuous precipitations were formed and by increasing the cooling rate, their amount reduced and their number and sizes decreased. Application of the deep cryogenic treatment with aging causes the dimensions of the secondary phases to be slightly larger than that of the non-deep cryogenic treatment state. Deep cryogenic treatment especially in samples with high cooling rate causes reducing the amount of Al, compared to usual stoichiometric value by formation of shrinkage stress in two stages (cooling after solutioning and deep cryogenic treatment). Deep cryogenic treatment in all of the samples increased the hardness, compared to the case without deep cryogenic treatment, by increasing the amount of Al out of the structure and providing conditions for the formation of more continuous and discontinuous phases.
Kurzfassung
In dieser Untersuchung wurde die Mg17Al12- Phase bei 413 °C innerhalb von 24 h aufgelöst. Diesem Vorgang folgte eine Abkühlung der Proben in unterschiedlichen Medien und bei unterschiedlichen Abkühlgeschwindigkeiten. Einige Proben wurden direkt ausgelagert, andere wiederum wurden vor dem Auslagern 24 h lang in flüssigen Stickstoff getaucht. In dieser Arbeit zur Gefügeuntersuchung wurden die Proben mithilfe eines Meiji-Lichtmikroskops und Rasterelektronenmikroskopie betrachtet. Zur Charakterisierung der chemischen Zusammensetzung wurde eine Analyse mittels energiedispersiver Spektroskopie durchgeführt. Die Ergebnisse zeigten, dass sich bei geringen Abkühlgeschwindigkeiten eine große Menge diskontinuierlicher Ausscheidungen bildet. Bei einer Erhöhung der Abkühlgeschwindigkeit kam es zu einer Abnahme ihrer Menge bzw. Anzahl sowie der Größen. Die Anwendung der Tiefsttemperaturbehandlung, kombiniert mit einer Auslagerung, führt dazu, dass die Abmessungen der Sekundärphasen etwas größer ausfallen als es im nicht tiefsttemperaturbehandelten Zustand der Fall wäre. Verglichen mit dem üblichen stöchiometrischen Wert führt eine Tiefsttemperaturbehandlung von Proben, insbesondere bei hoher Abkühlgeschwindigkeit, durch das Auftreten von Schrumpfspannung im Rahmen zweier Schritte (Abkühlen nach dem Lösungsglühen und Tiefsttemperaturbehandlung) zu einem Rückgang der Al-Menge. Im Vergleich zum Zustand ohne diese Behandlung führte die Tiefsttemperaturbehandlung in allen Proben durch eine Zunahme der Menge an aus dem Gefüge stammendem Al zu einem Härteanstieg und schafft die Bedingungen für die Bildung weiterer kontinuierlicher und diskontinuierlicher Phasen.
About the author
Seyed Reza Alavi Zaree was born in 1976 and studied B.Sc. of Metallurgy and Materials Science Engineering at Tehran University since 1994 to 1999 and then he studied M. Sc. of Metallurgy and Materials Science at Iran university of Science & Technology since 1999 to 2001. He got his doctorate at Institut für Werkstoffwissenschaft und Werkstofftechnologie, TU-Wien, Vienna, Austria in 2009 with a thesis on Characterization of hot extruded steel particulate composites. since 2009 to present, he is Assistant Professor in metallurgy and materials science at Shahid Chamran University of Ahvaz in Iran.
5 Acknowledgements
This research was funded by Shahid Chamran University of Ahvaz, Iran (Grant Numbers: SCU.EM98.236 and SCU. EM98.276). The authors would like to thank Ms. Bidarvandi for her efforts in this research.
5 Danksagung
Diese Forschungsarbeit wurde von der Shahid Chamran Universität von Ahvaz, Iran (Förderkennzeichen: SCU.EM98.236 und SCU.EM98.276) finanziert. Die Autoren möchten sich bei Frau Bidarvandi für ihre Bemühungen im Rahmen dieser Forschungsarbeit bedanken.
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Articles in the same Issue
- Contents
- Editorial
- Editorial
- Quantitative Structural Analysis of Superalloy Engine Disks
- Effect of Different Heat Treatments with and without Deep Cryogenic Treatment on the Morphology of Mg17Al12 Intermetallic Phase and Hardness of AZ91 Magnesium Alloy
- Failure analysis
- Torsional Overload Fracture of Twist-off Bolts During Assembly
- Picture of the Month
- Picture of the Month
- News
- Green hydrogen from New Zealand
- Meeting Diary
- Meeting diary
Articles in the same Issue
- Contents
- Editorial
- Editorial
- Quantitative Structural Analysis of Superalloy Engine Disks
- Effect of Different Heat Treatments with and without Deep Cryogenic Treatment on the Morphology of Mg17Al12 Intermetallic Phase and Hardness of AZ91 Magnesium Alloy
- Failure analysis
- Torsional Overload Fracture of Twist-off Bolts During Assembly
- Picture of the Month
- Picture of the Month
- News
- Green hydrogen from New Zealand
- Meeting Diary
- Meeting diary
